function parseTime(time, cFormat) {
  if (arguments.length === 0) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    if (('' + time).length === 10) time = parseInt(time) * 1000
    date = new Date(time)
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key]
    if (key === 'a') return ['一', '二', '三', '四', '五', '六', '日'][value - 1]
    if (result.length > 0 && value < 10) {
      value = '0' + value
    }
    return value || 0
  })
  return time_str
}

function formatTime(time, option) {
  const d = new Date(time)
  const now = Date.now()

  const diff = (now - d) / 1000

  if (diff < 30) {
    return '刚刚'
  } else if (diff < 3600) { // less 1 hour
    return Math.ceil(diff / 60) + '分钟前'
  } else if (diff < 3600 * 24) {
    return Math.ceil(diff / 3600) + '小时前'
  } else if (diff < 3600 * 24 * 2) {
    return '1天前'
  }
  if (option) {
    return parseTime(time, option)
  } else {
    return d.getMonth() + 1 + '月' + d.getDate() + '日' + d.getHours() + '时' +
      d.getMinutes() + '分'
  }
}

function formatNumber(size, n) {
  if (!size) return ''

  const num = n || 1000.00

  return size < num
    ? size + 'B'
    : size < Math.pow(num, 2)
      ? (size / num).toFixed(0) + 'K'
      : size < Math.pow(num, 3)
        ? (size / Math.pow(num, 2)).toFixed(0) + 'M'
        : size < Math.pow(num, 4)
          ? (size / Math.pow(num, 3)).toFixed(0) + 'G'
          : (size / Math.pow(num, 4)).toFixed(0) + 'T'
}

function gapTimeFormatter(row, column, cellValue, index) {
  return formatTime(cellValue,true)
}
function timeFormatter(row, column, cellValue, index) {
  return formatTime(cellValue)
}
function numberFormatter(row, column, cellValue, index) {
  return formatNumber(cellValue)
}

function hourTimeFormatter(row, column, value, index) {
  // console.log()
  const array = []
  for (let i = 1; i <= 3; i++) {
    array.push(toDoubleString(value % 60))
    value = parseInt(value / 60)
  }
  // console.log(array)
  return array.reverse().join(':')
}

function toDoubleString(number) {
  if (number < 10) {
    return '0' + number
  } else {
    return '' + number
  }
}

export default {
  methods: {
    formatTime,
    timeFormatter,
    numberFormatter,
    parseTime,
    gapTimeFormatter,
    hourTimeFormatter,
    formatNumber
  }
}
